# 9.2 使用类和实例
# 9.2.1 Car 类
class Car():
    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year

    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()


my_new_car = Car('audi', 'a8', 2019)
print(my_new_car.get_descriptive_name())


# 9.2.2 给属性指定默认值
class Car1():
    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()

    def read_odometer(self):
        print("This car has " + str(self.odometer_reading) + " miles on it.")


my_new_car = Car1('audi', 'a4', 2016)
print(my_new_car.get_descriptive_name())
my_new_car.read_odometer()


# 9.2.3 修改属性的值
class Car2():
    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0

    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name.title()

    def read_odometer(self):
        print("This car has " + str(self.odometer_reading) + " miles on it.")


my_new_car = Car2('audi', 'a4', 2016)
print(my_new_car.get_descriptive_name())
my_new_car.odometer_reading = 29
my_new_car.read_odometer()
